一种混凝土结构钢筋腐蚀的光纤传感监测装置

A optical fiber sensing monitoring device for reinforcement corrosion in concrete structures

钢筋的腐蚀逐渐成为影响钢筋混凝土结构耐久性的主要因素.腐蚀后的钢筋体积膨胀,保护层逐渐开裂,进而降低结构的使用性能、影响结构的耐久性.基于钢筋混凝土结构中钢筋腐蚀膨胀原理与光纤光栅应变传感技术原理,提出一种新型钢筋腐蚀监测装置.根据推导出的FBG波长与钢筋锈蚀率的关系,制作钢筋混凝土试件并进行加速试验.最后利用ABAQUS有限元软件结合试验结果进行数值模拟,模拟结果与试验结果相吻合.试验结果表明,设计出的新型钢筋腐蚀传感装置能有效的监测钢筋的腐蚀程度,可实现混凝土保护层开裂过程的全程监测.

Steel corrosion is becoming the main factor that affects the durability of reinforced concrete structures.The volume expansion of steel bar after corrosion causes the cover to crack gradually,which reduces structure performance and affects structural durability.Based on the corrosion expansion principle of steel bars in reinforced concrete structures and the principle of fiber grating strain sensing technology,a new corrosion monitoring device for steel bars is proposed and designed.According to the relationship between FBG wavelength and corrosion rate of steel bar,reinforced concrete specimens were made and accelerated test was carried out.Finally,ABAQUS finite element software is used to carry out numerical simulation with the experimental results,and the simulation results are in good agreement with the test results.The test results show that the new steel corrosion sensor can effectively monitor the corrosion degree of steel bars and realize the whole process monitoring of concrete cover cracking.